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                [Usaco2012 Jan]Video Game                 </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div class="problem-text" align="left"><span style="font-size: medium; "><span class="mono prewrap" id="probtext-text">Bessie is playing a video game! In the game, the three letters 'A', 'B', and 'C' are the only valid buttons. Bessie may press the buttons in any order she likes; however, there are only N distinct combos possible (1 &lt;= N &lt;= 20). Combo i is represented as a string S_i which has a length between 1 and 15 and contains only the letters 'A', 'B', and 'C'. Whenever Bessie presses a combination of letters that matches with a combo, she gets one point for the combo. Combos may overlap with each other or even finish at the same time! For example if N = 3 and the three possible combos are &quot;ABA&quot;, &quot;CB&quot;, and &quot;ABACB&quot;, and Bessie presses &quot;ABACB&quot;, she will end with 3 points. Bessie may score points for a single combo more than once. Bessie of course wants to earn points as quickly as possible. If she presses exactly K buttons (1 &lt;= K &lt;= 1,000), what is the maximum number of points she can earn?&nbsp;</span></span></div>
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<div class="problem-text" align="left"><span style="font-size: medium; "><span class="Apple-style-span" style="font-family: simsun; color: rgb(70, 70, 70); line-height: 21px; ">给出n个ABC串combo[1..n]和k，现要求生成一个长k的字符串S，问S与word[1..n]的最大匹配数</span></span></div></p><hr/><h3>输入格式</h3><p><p><font size="4">&nbsp;Line 1: Two space-separated integers: N and K. * Lines 2..N+1: Line i+1 contains only the string S_i, representing combo i.</font></p>
<p><font size="4">&nbsp;</font></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">Line 1: A single integer, the maximum number of points Bessie can obtain.<br />
</span></p></p><hr/><h3>样例输入</h3><pre> 3 7 ABA CB ABACB </pre><hr/><h3>样例输出</h3><pre> 
  4 </pre><hr/><h3>提示</h3><p><p>&nbsp;The optimal sequence of buttons in this case is ABACBCB, which gives 4 points--1 from ABA, 1 from ABACB, and 2 from CB.</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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